Hoshizaki JWE-620UA-6B - Manual (Page 34)

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Error
Code
Problem Operation Reset
H4
Internal Booster Tank Thermistor Error
(open)
Thermistor senses abnormal temperature
(at (heater off) or below -6°F (-21°C)).
Normal
(internal
booster tank
heaters off)
After replacing failed component,
alarm resets.
H5
ROM/RAM Error
Control board ROM/RAM fails.
Unit stops After replacing control board, alarm
resets.
H6
EEPROM Error
EEPROM fails.
Unit stops After replacing control board, alarm
resets.
H7
Phase Reversal Error
Power supply phase is reversed.
Unit stops After correcting the connection by
swapping two of three wires at the
power switch (GFCI) connection,
alarm resets.
2. Error Code Log
Use the "ON/OFF" button to turn off the unit. Press and hold the "MODE" button, then press
the "ON/OFF" button. "01" should appear on the display. Use the down arrow button to scroll
to service menu items 21 through 25 (Auxiliary Code U-1, U-2, U-3, V-0, A-0) or 26 through
30 (Auxiliary Code A-1 and later). 21 (Auxiliary Code U-1, U-2, U-3, V-0, A-0) or 26 (Auxiliary
Code A-1 and later) is the most recent error. Press the "MODE" button to view the selected
service menu item. Press the "MODE" button once again to return to the main service menu
list. If no errors exist in the log, "--" is displayed.
Press the "STANDBY/CLEANING" button to exit the service menu. The display goes
blank.
To erase the log, press and hold the up and down buttons for 3 seconds with one of the error
codes displayed. The unit beeps once and the entire log clears.